v.tr.1. a. To remove the load or cargo from.
b. To discharge (cargo or a load).
2. a. To relieve of something burdensome or oppressive; unburden: a confidant to whom he could unload his heart.
b. To give expression to (one's troubles or feelings); pour forth.
3. To remove the charge from (a firearm).
4. To dispose of, especially by selling in great quantity; dump.